security/wpa_supplicant: Add security patch set 2016-1
A vulnerability was found in how hostapd and wpa_supplicant writes the configuration file update for the WPA/WPA2 passphrase parameter. If this parameter has been updated to include control characters either through a WPS operation (CVE-2016-4476) or through local configuration change over the wpa_supplicant control interface (CVE-2016-4477), the resulting configuration file may prevent the hostapd and wpa_supplicant from starting when the updated file is used. In addition for wpa_supplicant, it may be possible to load a local library file and execute code from there with the same privileges under which the wpa_supplicant process runs. These patches were developed upstream and published as a response to the security advisories CVE-2016-4476 and CVE-2016-4477. PR: 209564 Requested by: Sevan Janiyan
This commit is contained in:
John Marino
parent
2f60f47b95
commit
5c93ecbe9e
Notes:
svn2git
2021-03-31 03:12:20 +00:00
svn path=/head/; revision=415527
@ -2,7 +2,7 @@
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PORTNAME= wpa_supplicant
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PORTVERSION= 2.5
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PORTREVISION= 1
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PORTREVISION= 2
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CATEGORIES= security net
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MASTER_SITES= http://w1.fi/releases/
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@ -0,0 +1,76 @@
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From ecbb0b3dc122b0d290987cf9c84010bbe53e1022 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <jouni@qca.qualcomm.com>
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Date: Fri, 4 Mar 2016 17:20:18 +0200
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Subject: [PATCH 1/5] WPS: Reject a Credential with invalid passphrase
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WPA/WPA2-Personal passphrase is not allowed to include control
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characters. Reject a Credential received from a WPS Registrar both as
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STA (Credential) and AP (AP Settings) if the credential is for WPAPSK or
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WPA2PSK authentication type and includes an invalid passphrase.
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This fixes an issue where hostapd or wpa_supplicant could have updated
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the configuration file PSK/passphrase parameter with arbitrary data from
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an external device (Registrar) that may not be fully trusted. Should
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such data include a newline character, the resulting configuration file
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could become invalid and fail to be parsed.
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Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
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---
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src/utils/common.c | 12 ++++++++++++
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src/utils/common.h | 1 +
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src/wps/wps_attr_process.c | 10 ++++++++++
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3 files changed, 23 insertions(+)
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--- src/utils/common.c
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+++ src/utils/common.c
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@@ -697,6 +697,18 @@ int is_hex(const u8 *data, size_t len)
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}
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+int has_ctrl_char(const u8 *data, size_t len)
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+{
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+ size_t i;
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+
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+ for (i = 0; i < len; i++) {
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+ if (data[i] < 32 || data[i] == 127)
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+ return 1;
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+ }
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+ return 0;
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+}
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+
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+
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size_t merge_byte_arrays(u8 *res, size_t res_len,
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const u8 *src1, size_t src1_len,
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const u8 *src2, size_t src2_len)
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--- src/utils/common.h
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+++ src/utils/common.h
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@@ -488,6 +488,7 @@ const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len);
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char * wpa_config_parse_string(const char *value, size_t *len);
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int is_hex(const u8 *data, size_t len);
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+int has_ctrl_char(const u8 *data, size_t len);
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size_t merge_byte_arrays(u8 *res, size_t res_len,
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const u8 *src1, size_t src1_len,
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const u8 *src2, size_t src2_len);
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--- src/wps/wps_attr_process.c
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+++ src/wps/wps_attr_process.c
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@@ -229,6 +229,16 @@ static int wps_workaround_cred_key(struct wps_credential *cred)
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cred->key_len--;
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#endif /* CONFIG_WPS_STRICT */
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}
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+
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+
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+ if (cred->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK) &&
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+ (cred->key_len < 8 || has_ctrl_char(cred->key, cred->key_len))) {
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+ wpa_printf(MSG_INFO, "WPS: Reject credential with invalid WPA/WPA2-Personal passphrase");
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+ wpa_hexdump_ascii_key(MSG_INFO, "WPS: Network Key",
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+ cred->key, cred->key_len);
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+ return -1;
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+ }
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+
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return 0;
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}
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--
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1.9.1
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@ -0,0 +1,49 @@
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From 73e4abb24a936014727924d8b0b2965edfc117dd Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <jouni@qca.qualcomm.com>
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Date: Fri, 4 Mar 2016 18:46:41 +0200
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Subject: [PATCH 2/5] Reject psk parameter set with invalid passphrase
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character
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WPA/WPA2-Personal passphrase is not allowed to include control
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characters. Reject a passphrase configuration attempt if that passphrase
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includes an invalid passphrase.
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This fixes an issue where wpa_supplicant could have updated the
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configuration file psk parameter with arbitrary data from the control
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interface or D-Bus interface. While those interfaces are supposed to be
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accessible only for trusted users/applications, it may be possible that
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an untrusted user has access to a management software component that
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does not validate the passphrase value before passing it to
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wpa_supplicant.
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This could allow such an untrusted user to inject up to 63 characters of
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almost arbitrary data into the configuration file. Such configuration
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file could result in wpa_supplicant trying to load a library (e.g.,
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opensc_engine_path, pkcs11_engine_path, pkcs11_module_path,
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load_dynamic_eap) from user controlled location when starting again.
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This would allow code from that library to be executed under the
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wpa_supplicant process privileges.
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Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
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---
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wpa_supplicant/config.c | 6 ++++++
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1 file changed, 6 insertions(+)
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--- wpa_supplicant/config.c
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+++ wpa_supplicant/config.c
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@@ -478,6 +478,12 @@ static int wpa_config_parse_psk(const struct parse_data *data,
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}
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wpa_hexdump_ascii_key(MSG_MSGDUMP, "PSK (ASCII passphrase)",
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(u8 *) value, len);
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+ if (has_ctrl_char((u8 *) value, len)) {
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+ wpa_printf(MSG_ERROR,
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+ "Line %d: Invalid passphrase character",
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+ line);
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+ return -1;
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+ }
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if (ssid->passphrase && os_strlen(ssid->passphrase) == len &&
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os_memcmp(ssid->passphrase, value, len) == 0) {
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/* No change to the previously configured value */
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--
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1.9.1
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@ -0,0 +1,76 @@
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From 0fe5a234240a108b294a87174ad197f6b5cb38e9 Mon Sep 17 00:00:00 2001
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From: Paul Stewart <pstew@google.com>
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Date: Thu, 3 Mar 2016 15:40:19 -0800
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Subject: [PATCH 3/5] Remove newlines from wpa_supplicant config network
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output
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Spurious newlines output while writing the config file can corrupt the
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wpa_supplicant configuration. Avoid writing these for the network block
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parameters. This is a generic filter that cover cases that may not have
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been explicitly addressed with a more specific commit to avoid control
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characters in the psk parameter.
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Signed-off-by: Paul Stewart <pstew@google.com>
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---
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src/utils/common.c | 11 +++++++++++
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src/utils/common.h | 1 +
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wpa_supplicant/config.c | 15 +++++++++++++--
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3 files changed, 25 insertions(+), 2 deletions(-)
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--- src/utils/common.c
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+++ src/utils/common.c
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@@ -709,6 +709,17 @@ int has_ctrl_char(const u8 *data, size_t len)
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}
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+int has_newline(const char *str)
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+{
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+ while (*str) {
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+ if (*str == '\n' || *str == '\r')
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+ return 1;
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+ str++;
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+ }
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+ return 0;
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+}
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+
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+
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size_t merge_byte_arrays(u8 *res, size_t res_len,
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const u8 *src1, size_t src1_len,
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const u8 *src2, size_t src2_len)
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--- src/utils/common.h
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+++ src/utils/common.h
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@@ -489,6 +489,7 @@ const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len);
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char * wpa_config_parse_string(const char *value, size_t *len);
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int is_hex(const u8 *data, size_t len);
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int has_ctrl_char(const u8 *data, size_t len);
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+int has_newline(const char *str);
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size_t merge_byte_arrays(u8 *res, size_t res_len,
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const u8 *src1, size_t src1_len,
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const u8 *src2, size_t src2_len);
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--- wpa_supplicant/config.c
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+++ wpa_supplicant/config.c
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@@ -2699,8 +2699,19 @@ char * wpa_config_get(struct wpa_ssid *ssid, const char *var)
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for (i = 0; i < NUM_SSID_FIELDS; i++) {
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const struct parse_data *field = &ssid_fields[i];
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- if (os_strcmp(var, field->name) == 0)
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- return field->writer(field, ssid);
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+ if (os_strcmp(var, field->name) == 0) {
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+ char *ret = field->writer(field, ssid);
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+
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+ if (ret && has_newline(ret)) {
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+ wpa_printf(MSG_ERROR,
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+ "Found newline in value for %s; not returning it",
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+ var);
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+ os_free(ret);
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+ ret = NULL;
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+ }
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+
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+ return ret;
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+ }
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}
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return NULL;
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--
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1.9.1
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@ -0,0 +1,60 @@
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From b166cd84a77a6717be9600bf95378a0055d6f5a5 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <jouni@qca.qualcomm.com>
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Date: Tue, 5 Apr 2016 23:33:10 +0300
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Subject: [PATCH 4/5] Reject SET_CRED commands with newline characters in the
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string values
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Most of the cred block parameters are written as strings without
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filtering and if there is an embedded newline character in the value,
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unexpected configuration file data might be written.
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This fixes an issue where wpa_supplicant could have updated the
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configuration file cred parameter with arbitrary data from the control
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interface or D-Bus interface. While those interfaces are supposed to be
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accessible only for trusted users/applications, it may be possible that
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an untrusted user has access to a management software component that
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does not validate the credential value before passing it to
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wpa_supplicant.
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This could allow such an untrusted user to inject almost arbitrary data
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into the configuration file. Such configuration file could result in
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wpa_supplicant trying to load a library (e.g., opensc_engine_path,
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pkcs11_engine_path, pkcs11_module_path, load_dynamic_eap) from user
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controlled location when starting again. This would allow code from that
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library to be executed under the wpa_supplicant process privileges.
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Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
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---
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wpa_supplicant/config.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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--- wpa_supplicant/config.c
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+++ wpa_supplicant/config.c
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@@ -2896,6 +2896,8 @@ int wpa_config_set_cred(struct wpa_cred *cred, const char *var,
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if (os_strcmp(var, "password") == 0 &&
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os_strncmp(value, "ext:", 4) == 0) {
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+ if (has_newline(value))
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+ return -1;
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str_clear_free(cred->password);
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cred->password = os_strdup(value);
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cred->ext_password = 1;
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@@ -2946,9 +2948,14 @@ int wpa_config_set_cred(struct wpa_cred *cred, const char *var,
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}
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val = wpa_config_parse_string(value, &len);
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- if (val == NULL) {
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+ if (val == NULL ||
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+ (os_strcmp(var, "excluded_ssid") != 0 &&
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+ os_strcmp(var, "roaming_consortium") != 0 &&
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+ os_strcmp(var, "required_roaming_consortium") != 0 &&
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+ has_newline(val))) {
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wpa_printf(MSG_ERROR, "Line %d: invalid field '%s' string "
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"value '%s'.", line, var, value);
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+ os_free(val);
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return -1;
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}
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--
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1.9.1
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@ -0,0 +1,48 @@
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From 2a3f56502b52375c3bf113cf92adfa99bad6b488 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <jouni@qca.qualcomm.com>
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Date: Tue, 5 Apr 2016 23:55:48 +0300
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Subject: [PATCH 5/5] Reject SET commands with newline characters in the
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string values
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Many of the global configuration parameters are written as strings
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without filtering and if there is an embedded newline character in the
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value, unexpected configuration file data might be written.
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This fixes an issue where wpa_supplicant could have updated the
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configuration file global parameter with arbitrary data from the control
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interface or D-Bus interface. While those interfaces are supposed to be
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accessible only for trusted users/applications, it may be possible that
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an untrusted user has access to a management software component that
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does not validate the value of a parameter before passing it to
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wpa_supplicant.
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This could allow such an untrusted user to inject almost arbitrary data
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into the configuration file. Such configuration file could result in
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wpa_supplicant trying to load a library (e.g., opensc_engine_path,
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pkcs11_engine_path, pkcs11_module_path, load_dynamic_eap) from user
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controlled location when starting again. This would allow code from that
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library to be executed under the wpa_supplicant process privileges.
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Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
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---
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wpa_supplicant/config.c | 6 ++++++
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1 file changed, 6 insertions(+)
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--- wpa_supplicant/config.c
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+++ wpa_supplicant/config.c
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@@ -3764,6 +3764,12 @@ static int wpa_global_config_parse_str(const struct global_parse_data *data,
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return -1;
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}
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+ if (has_newline(pos)) {
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+ wpa_printf(MSG_ERROR, "Line %d: invalid %s value with newline",
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+ line, data->name);
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+ return -1;
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+ }
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+
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tmp = os_strdup(pos);
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if (tmp == NULL)
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return -1;
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--
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1.9.1
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